A poser is someone who tries to give off the illusion that they are more than what they actually are.

Some people are conscious posers.

Some people are unconscious posers and will defend to the death the notion that they are simply "watch connoisseurs" or that they just like Louis Vuitton handbags for their artistry or quality and that price or perceived prestige has nothing to do with it.

These are the same people who complain ad nauseum about replica watches or replica handbags.

If you actively complain about someone paying a few hundred bucks for a replica Rolex, there's a very good chance that you are poser. The person paying a few hundred bucks for a replica Rolex is also a poser.